The classic Abraham-Minkowski problem (for some original references see [1]}, [2]}, [3]}), focuses on what is the correct, or at least the most convenient, expression for photon momentum propagating an a dielectric medium. To give a proper background for the present investigation, let us begin with the general expression for the basic electromagnetic force density \({\bf f}\)  in an isotropic dispersive fluid with mass density \( \rho _m\) , [4]}, [5]}, [6]},
\({\bf f}=&\rho {\bf E}+{\bf J\times B} - \frac{1}{2}\varepsilon _0 E^2{\bf \nabla } \varepsilon -\frac{1}{2}\mu _0H^2{\bf \nabla }\mu + \frac{1}{2}\varepsilon _0 {\bf \nabla }\left[ E^2\rho _m\frac{\partial \varepsilon }{\partial \rho _m}\right]+\frac{1}{2}\mu _0 {\bf \nabla }\left[ H^2\rho _m\frac{\partial \mu }{\partial \rho _m}\right] \\& +\frac{n^2-1}{c^2}\frac{\partial }{\partial t}{\bf (E\times H)}. \) 
